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Ambient noise tomography of a linear seismic array based on an improved Voronoi tessellation

Earthquake Science 2023年第6期36卷 477-490页

作者： Kun Wang Weitao Wang Libo Han Tingzi Li Yuan Ling Jianchao Zhou Huaiyu Yuan Institute of Geophysics China Earthquake AdministrationBeijing 100081China Institute of Geology and Geophysics Chinese Academic of SciencesBeijing 100029China Geological Survey of Western Australia PerthWA 6001Australia

Ambient noise tomography,when applied to a dense linear seismic array,has the capability to provide detailed insights into the fine velocity structures across diverse tectonic *** linear station arrangement naturally generates parallel and concentrated ray paths along the array *** unique geometry requires specific optimization of the inversion methodology and model *** bayesian-based transdimensional inversion method,characterized by its fully non-linear nature and high degree of freedom in parameter settings,offers a powerful tool for ambient noise *** effectively adapt this method to a linear array layout,we propose a modification to the Voronoi cell tessellation built in the transdimensional *** introducing spatial priority to the Voronoi kernels,we strategically increased the density of Voronoi cells along the direction of the *** then applied the modified approach to a linear seismic array in the North China Craton and validated its robustness through phase velocity images and resolution *** improved non-uniform sampling technique in the 2-D model space accelerates convergence while simultaneously enhancing model *** with the conventional damped leastsquares method,the proposed algorithm revealed a shear-wave velocity map with notable low-velocity anomalies situated in the middle and lower crust beneath the borders of the Ordos block and its surrounding orogenic *** with the crustal structures revealed by receiver function and electrical imaging,our findings indicated that the western and eastern margins of the Ordos block had experienced intensive crustal wedge deformation and re-melting,respectively.

关键词： Voronoi cell transdimensional bayesian method ambient noise inversion S velocity North China Craton

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